package com.example.skycode.servlet;

import com.example.skycode.dao.NewsDao;
import com.example.skycode.bean.news;


import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;

/**
 * 1.配置网址映衬
 * 2.接受前端接收到的数据
 * 3.查询数据（增删改查）
 * 4.页面的跳转或显示（数据给前端）
 */
@WebServlet("/news.html")
public class NewsServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        req.setCharacterEncoding("UTF-8");//请求参数类型设置
        String sp = req.getParameter("page");//前端的参数都是string类型
        int page = 1;
        if (sp != null && !sp.equals("")){//传了情况下
            page = Integer.parseInt(sp);//将前端字符数字强制转化为整形
        }
        NewsDao newsDao = new NewsDao();
        List<news> list = newsDao.getList(page);//分页查询
        req.setAttribute("list",list);//通过req将list数据传递给前端
        req.getRequestDispatcher("WEB-INF/news.jsp").forward(req,resp);
    }
}
